A company produced $8$ dishwasher machines in $2015.$ The company sold $6$ in $2015$ and added $2$ to its inventories. The market value of the dishwasher machines in $2015$ was $$200$ per unit. What is the value of this company's output that will be included in the $2015$ GDP$?$

A$.$ $$400.$

B$.$ $$1,400.$

C$.$ $$1,600.$

D$.$ $$2,000.$